/Engine/Source/Developer/TreeMap/Public/STreeMap.h
Pops up a box to allow the user to start renaming a node's title (undoable!)
void StartRenamingNode ( const [FGeometry](API\Runtime\SlateCore\Layout\FGeometry) & MyGeometry, const FTreeMapNodeDataRef & NodeData, const FVector2D & RelativePosition, const bool bIsNewNode )